[PATCH] Added the variable NO_GCC44 to the system

The purpose of this change is allow to the developers skip the compilation of
GCC 4.1 and 4.4 and save the time spent in the compilation of GCC, when they
are compiling the system with other compiler (like clang).
---
Makefile.inc1 | 4 ++++
etc/defaults/make.conf | 1 +
gnu/lib/Makefile | 5 ++++-
gnu/usr.bin/Makefile | 2 ++
share/man/man5/make.conf.5 | 3 +++
5 files changed, 14 insertions(+), 1 deletions(-)